US20100291319A1 - Plasma processing apparatus and plasma processing method - Google Patents
Plasma processing apparatus and plasma processing method Download PDFInfo
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- US20100291319A1 US20100291319A1 US12/680,645 US68064508A US2010291319A1 US 20100291319 A1 US20100291319 A1 US 20100291319A1 US 68064508 A US68064508 A US 68064508A US 2010291319 A1 US2010291319 A1 US 2010291319A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32623—Mechanical discharge control means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32458—Vessel
- H01J37/32477—Vessel characterised by the means for protecting vessels or internal parts, e.g. coatings
- H01J37/32495—Means for protecting the vessel against plasma
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- Formation Of Insulating Films (AREA)
Abstract
A plasma processing apparatus for plasma-processing a target substrate is provided. The plasma processing apparatus includes a metallic processing container forming a processing space in which a plasma process is performed, and a substrate mounting table provided in the processing space to mount a target substrate thereon, a quartz member which shields a sidewall of the metallic processing container from the processing space and whose lower end extends to a position lower than a substrate mounting surface of the substrate mounting table, an annular member which is made of quartz and is provided between a bottom surface of the quartz member and a bottom wall of the metallic processing container to shield the bottom wall of the metallic processing container from the processing space, and a processing gas inlet part for introducing a processing gas into the processing space from a vicinity of an outer periphery of the substrate mounting table.
Description
- The present invention relates to a processing apparatus and a processing method for performing a process on a target substrate such as a semiconductor wafer; and, more particularly, to a plasma processing apparatus and a plasma processing method for performing a plasma process on a target substrate by using a plasma.
- In recent years, a design rule of large scale integration (LSI) semiconductor devices is getting finer to meet the demand for higher integration and higher speed LSI. Further, the size of semiconductor wafers is increasing to improve production yield. Along with these trends, an apparatus for performing a process on a target substrate such as a semiconductor wafer is required to cope with the miniaturization of the devices and an increase in the size of the wafers.
- In a recent semiconductor process, a plasma processing apparatus is commonly used for film formation and etching. Particularly, growing attention has been paid to a plasma processing apparatus capable of generating a plasma having a low electron temperature in a high density (see, e.g., Japanese Patent Application Publication No. 2003-133298).
- However, when the substrate is directly oxidized or nitrified by using the plasma processing apparatus, a processing rate such as an oxidation rate or nitration rate is low. Further, a metallic member is used for a processing container and, thus, metal contamination may occur by a plasma action.
- It is an object of the present invention to provide a plasma processing apparatus and a plasma processing method capable of achieving a high processing rate.
- In accordance with a first aspect of the present invention, there is provided a plasma processing apparatus including a metallic processing container forming a processing space in which a plasma process is performed; a substrate mounting table provided in the processing space to mount a target substrate thereon; a quartz member which shields a sidewall of the metallic processing container from the processing space and whose lower end extends to a position lower than a substrate mounting surface of the substrate mounting table; an annular member which is made of quartz and is provided between a bottom surface of the quartz member and a bottom wall of the metallic processing container to shield the bottom wall of the metallic processing container from the processing space; and a processing gas inlet section for introducing a processing gas into the processing space from a vicinity of an outer periphery of the substrate mounting table.
- In accordance with a second aspect of the present invention, there is provided a plasma processing apparatus including a metallic processing container forming a processing space in which a plasma process is performed; a substrate mounting table provided in the processing space to mount a target substrate thereon; a quartz ceiling plate provided at an upper portion of the processing container to face a substrate mounting surface of the substrate mounting table and having a cylindrical portion which shields a sidewall of the metallic processing container from the processing space; a microwave antenna coupled to the quartz ceiling plate; a quartz plate which is provided between a bottom surface of the cylindrical portion and a bottom wall of the metallic processing container to shield the bottom wall of the metallic processing container from the processing space; and a processing gas inlet section for introducing a processing gas into the processing space from a vicinity of an outer periphery of the substrate mounting table.
- In accordance with a third aspect of the present invention, there is provided a plasma processing method for forming a film by using a microwave plasma, the method including supplying a microwave to a dielectric enclosing an outer periphery or an upper surface of a target substrate and allowing a microwave to pass therethrough; and supplying a processing gas from the outer periphery of or below the target substrate while the microwave is supplied to the dielectric.
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FIG. 1A is a horizontal cross sectional view schematically showing a plasma processing apparatus in accordance with an embodiment of the present invention. -
FIG. 1B is a cross sectional view taken alongline 1B-1B ofFIG. 1A . -
FIGS. 2A and 2B depict side views of the ceiling plate seen from the loading/unloading port. -
FIGS. 3A and 3B present side views of the shutter seen from the loading/unloading port. -
FIGS. 4A and 4B illustrate vertical movements of the shutter in conjunction with the gate valve. -
FIG. 5 is an enlarged cross sectional view of the periphery of the processing gas inlet opening. -
FIG. 6A depicts a plan view of the quartz plate. -
FIG. 6B is a cross sectional view taken alongline 6B-6B ofFIG. 6A . -
FIG. 7 illustrates an example of the RLSA plasma processing apparatus in accordance with the embodiment of the present invention. -
FIG. 8A is a table showing the results of a silicon oxide film formation test. -
FIG. 8B illustrates the results of a process for forming a silicon oxide film by using a conventional apparatus. -
FIG. 9 illustrates the results of comparison between the results ofFIG. 8A and the results ofFIG. 8B . -
FIG. 10 is a graph showing the results ofFIG. 9 . -
FIG. 11A is a cross sectional view schematically showing the apparatus in accordance with the embodiment of the present invention. -
FIG. 11B is a cross sectional view schematically showing the apparatus of the comparative example. - Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings which form a part hereof.
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FIG. 1A is a horizontal cross sectional view schematically showing a plasma processing apparatus using a microwave plasma in accordance with an embodiment of the present invention.FIG. 1B is a cross sectional view taken alongline 1B-1B ofFIG. 1A . - The plasma processing apparatus shown in
FIGS. 1A and 1B is a radial line slot antenna (RLSA)plasma processing apparatus 100. In theplasma processing apparatus 100, a microwave is generated and introduced into a processing chamber by using the RLSA such that a plasma having a low electron temperature of 2 eV or less is generated in a high density of 5×1010 to 1×1013/cm3 in the processing chamber. - The
plasma processing apparatus 100 of the present embodiment includes ametallic processing container 2 forming aprocessing space 1 in which a plasma process is performed, a substrate mounting table 3 provided in theprocessing space 1 to mount a target substrate W thereon, and aceiling plate 4 which is made of quartz, is provided at an upper portion of theprocessing container 2 to face asubstrate mounting surface 3 a of the substrate mounting table 3 and has acylindrical portion 4 a made of high purity quartz and having a function of shielding asidewall 2 a of theprocessing container 2 from theprocessing space 1. Theplasma processing apparatus 100 further includes amicrowave antenna 5 coupled to theceiling plate 4 and a quartz plate which is made of high purity quartz and is provided between a bottom surface of thecylindrical portion 4 a and abottom wall 2 b of theprocessing container 2 to shield thebottom wall 2 b from theprocessing space 1. - The
processing container 2 is made of, e.g., aluminum or an aluminum alloy. In this embodiment, theprocessing container 2 includes aprocessing chamber 2 c and agrounded lid 2 d. Thelid 2 d is airtightly placed on theprocessing chamber 2 c and theceiling plate 4 is airtightly placed on and supported by thelid 2 d, thereby forming the airtightcylindrical processing space 1. - A
circular opening 2 e is formed at a substantially central portion of thebottom wall 2 b of theprocessing chamber 2 c. Thebottom wall 2 b is connected to a metallicgas exhaust room 7 via theopening 2 e, the gas exhaust room communicating with theprocessing space 1. Thegas exhaust room 7 is made of metal, e.g., aluminum or an aluminum alloy in the same way as theprocessing container 2, and, in the present embodiment, has a cylindrical shape. - Further, a supporting
column 8 is disposed in the cylindricalgas exhaust room 7 to support a central portion of the substrate mounting table 3. The substrate mounting table 3 supported at a front end of the supportingcolumn 8 is disposed in theprocessing space 1. - A loading/unloading
port 2 f through which the target substrate W is loaded into/unloaded from theprocessing space 1 is formed at a portion of thesidewall 2 a of theprocessing container 2. Agate valve 9 capable of being opened and closed is attached to the loading/unloadingport 2 f. When the target substrate W is loaded into/unloaded from theprocessing space 1, thegate valve 9 is opened and theprocessing space 1 communicates with the outside. When the target substrate W is processed in theprocessing space 1, thegate valve 9 is closed and theprocessing space 1 is blocked from the outside. - The
ceiling plate 4 is disposed on thelid 2 d and airtightly fixed thereto. Theceiling plate 4 has a circular shape and thecylindrical portion 4 a is provided to extend downward from a periphery of theceiling plate 4 along thesidewall 2 a of theprocessing container 2 in a curtain shape. Thecylindrical portion 4 a is formed integrally with theceiling plate 4 and is made of high purity quartz in the same way as theceiling plate 4. - The
cylindrical portion 4 a serves to shield thesidewall 2 a from theprocessing space 1. However, as described above, the loading/unloadingport 2 f is formed at the portion of thesidewall 2 a. If thecylindrical portion 4 a blocks the loading/unloadingport 2 f, loading and unloading the target substrate W cannot be performed. Accordingly, acutoff portion 4 b is provided at a portion of thecylindrical portion 4 a corresponding to the loading/unloadingport 2 f to enable the loading and unloading of the target substrate W. -
FIGS. 2A and 2B illustrate side views of theceiling plate 4 seen from the loading/unloadingport 2 f. As shown inFIG. 2A , thecylindrical portion 4 a of the ceiling plate is provided with thecutoff portion 4 b corresponding to the loading/unloadingport 2 f. - Further, as shown in
FIG. 2B , thebottom surface 4 d of thecylindrical portion 4 a is arranged at a position lower than thesubstrate mounting surface 3 a of the substrate mounting table 3. By arranging thebottom surface 4 d at a position lower than thesubstrate mounting surface 3 a, a region above the target substrate W in which the plasma is particularly uniformly generated in theprocessing space 1 can be enclosed with thecylindrical portion 4 a. Accordingly, thesidewall 2 a of themetallic processing container 2 is prevented from being in contact with the plasma, thereby suppressing contamination due to metal scattered from thesidewall 2 a. - At the outside of the
processing container 2, as described above, thegate valve 9 made of metal such as aluminum, an aluminum alloy or the like is provided such that the loading/unloadingport 2 f is interposed between thecylindrical portion 4 a and thegate valve 9. Because of thecutoff portion 4 b provided in thecylindrical portion 4 a, a portion of thesidewall 2 a in the vicinity of the loading/unloadingport 2 f, an inner wall of the loading/unloadingport 2 f, and thegate valve 9 are exposed to theprocessing space 1. - In the present embodiment, a
shutter 10 made of quartz is provided at a position corresponding to thecutoff portion 4 b and facing theprocessing space 1. Theshutter 10 covers not to expose the portion of thesidewall 2 a in the vicinity of the loading/unloadingport 2 f, the inner wall of the loading/unloadingport 2 f, and the inner surface of thegate valve 9 to theprocessing space 1. Accordingly, the plasma is prevented from being in contact with the metallic members, thereby suppressing the metal contamination. - The
shutter 10 vertically moves in conjunction with, e.g., opening/closing of thegate valve 9. When thegate valve 9 is closed, theshutter 10 is moved up to shield thecutoff portion 4 b. On the other hand, when thegate valve 9 is opened, theshutter 10 is moved down to disclose thecutoff portion 4 b.FIGS. 3A and 3B illustrate side views of theshutter 10 seen from the loading/unloadingport 2 f. - As shown in
FIGS. 3A and 3B , theshutter 10 is connected to a drivingunit 10 b via ashaft 10 a. The drivingunit 10 b vertically moves theshaft 10 a, thereby vertically moving theshutter 10 installed at a front end of theshaft 10 a.FIG. 3A shows theshutter 10 moved up andFIG. 3B shows theshutter 10 moved down.FIGS. 4A and 4B illustrate vertical movements of theshutter 10 in conjunction with thegate valve 9. - When the
gate valve 9 is closed, as shown inFIG. 4A , theshutter 10 shields thecutoff portion 4 b. When thegate valve 9 is opened, as shown inFIG. 4B , theshutter 10 is moved down to disclose thecutoff portion 4 b. When thegate valve 9 is closed, theshutter 10 is moved up to shield thecutoff portion 4 b as shown inFIG. 4A . - Further, as shown in cross sectional views of
FIGS. 4A and 4B , asurface 10 c of theshutter 10 facing theprocessing space 1 has a width and height different from those of asurface 10 d of theshutter 10 facing the loading/unloadingport 2 f. In this embodiment, thesurface 10 c facing theprocessing space 1 has a width and height respectively smaller than those of thesurface 10 d facing the loading/unloadingport 2 f. Further, thesurface 10 c has a width and height respectively smaller than those of thecutoff portion 4 b such that thesurface 10 c is received in thecutoff portion 4 b. - On the contrary, the
surface 10 d facing the loading/unloadingport 2 f has a width and height larger than those of thecutoff portion 4 b such that thesurface 10 d overlaps with a peripheral portion of thecutoff portion 4 b. Accordingly, it is possible to eliminate a clearance passing straight from theprocessing space 1 to the loading/unloadingport 2 f between thecutoff portion 4 b and theshutter 10. - In this embodiment, the clearance between the
cutoff portion 4 b and theshutter 10 is bent. By bending the clearance, the portion of thesidewall 2 a in the vicinity of the loading/unloadingport 2 f, the inner wall of the loading/unloadingport 2 f and thegate valve 9 are not seen directly from theprocessing space 1. Accordingly, compared to a case in which a straight clearance is present between theshutter 10 and thecutoff portion 4 b, it is possible that the portion of thesidewall 2 a in the vicinity of the loading/unloadingport 2 f, the inner wall of the loading/unloadingport 2 f and thegate valve 9 are hardly exposed to theprocessing space 1. - A processing gas inlet opening 2 g is formed at the
lid 2 d of theprocessing container 2 to introduce a processing gas into theprocessing space 1. The processing gas inlet opening 2 g passes through thesidewall 2 a. In this embodiment, thecylindrical portion 4 a of the ceiling plate is formed along thesidewall 2 a. In this state, the processing gas inlet opening 2 g is obstructed by thecylindrical portion 4 a and, thus, the processing gas cannot be introduced into theprocessing space 1. - Therefore, the following study is proposed in this embodiment.
FIG. 5 illustrates an enlarged cross sectional view of the periphery of the processing gas inlet opening 2 g. - As shown in
FIG. 5 , theclearance 4 c is set between thecylindrical portion 4 a and thesidewall 2 a. Aprocessing gas 2 h injected from the processing gas inlet opening 2 g collides with thecylindrical portion 4 a and is directed to thebottom surface 4 d of thecylindrical portion 4 a through theclearance 4 c. Theprocessing gas 2 h is injected into theprocessing space 1 through an area below thebottom surface 4 d. - In order to efficiently form a flow of the
processing gas 2 h, a first flowpath forming member 11 is provided between thecylindrical portion 4 a and thesidewall 2 a of theprocessing container 2. The first flowpath forming member 11 is made of, e.g., high purity quartz. - The first flow
path forming member 11 has a cylindrical shape in the same way as thecylindrical portion 4 a. The first flowpath forming member 11 has avertical portion 11 a extending vertically in a curtain shape along thecylindrical portion 4 a. Further, the first flowpath forming member 11 includes a cutoff portion not to interrupt loading/unloading of the target substrate W at the loading/unloadingport 2 f in the same way as thecylindrical portion 4 a. The first flowpath forming member 11 having thevertical portion 11 a guides theprocessing gas 2 h toward thebottom surface 4 d of thecylindrical portion 4 a along thecylindrical portion 4 a. - Further, the first flow
path forming member 11 has ahorizontal portion 11 b extending horizontally below thebottom surface 4 d. Theprocessing gas 2 h changes its flowing direction from the vertical direction to the horizontal direction by the horizontal portion lib, and is introduced into theprocessing space 1 through the area below thebottom surface 4 d. Thus, a processing gas inlet section is provided at an annular and slit-shaped gap between thequartz plate 6 and thebottom surface 4 d of thecylindrical portion 4 a. - A bias voltage may be applied to the substrate mounting table 3. For example, when the
processing container 2 has a ground potential, a potential different from the ground potential is supplied to the substrate mounting table 3. A potential difference between the potential supplied to the substrate mounting table 3 and the ground potential becomes a bias voltage of the substrate mounting table 3. - Meanwhile, in the
plasma processing apparatus 100 in accordance with this embodiment, thesidewall 2 a of theprocessing container 2 is covered with thecylindrical portion 4 a made of quartz, i.e., a dielectric, as shown inFIG. 5 . Accordingly, since the dielectric is present between the substrate mounting table 3 and theprocessing container 2, it may be difficult to apply a stable bias voltage to the substrate mounting table 3. - In this regard, a second flow
path forming member 2 i made of metal such as aluminum, an aluminum alloy or the like, is provided at theprocessing container 2 to extend to the vicinity of thesubstrate mounting surface 3 a of the substrate mounting table 3, in the present embodiment. The second flowpath forming member 2 i is formed integrally with the groundedlid 2 d to extend in a curtain shape along thecylindrical portion 4 a between the first flowpath forming member 11 and thecylindrical portion 4 a. The second flowpath forming member 2 i may be formed separately from thelid 2 d. - As described above, by providing the second flow
path forming member 2 i extending to the vicinity of thesubstrate mounting surface 3 a to form a ground potential point in the vicinity of the substrate mounting table 3, although thecylindrical portion 4 a made of a dielectric is present between the substrate mounting table 3 and theprocessing container 2, it is possible to apply a stable bias voltage to the substrate mounting table 3. - Further, although the second flow
path forming member 2 i is represented by a dashed double-dotted line inFIG. 5 , the second flowpath forming member 2 i formed integrally with the groundedlid 2 d is represented by a solid line inFIG. 1B . - The
quartz plate 6 is horizontally provided between thebottom surface 4 d of thecylindrical portion 4 a and thebottom wall 2 b of theprocessing container 2 to shield thebottom wall 2 b of theprocessing container 2 from theprocessing space 1. Thequartz plate 6 is provided with a gas exhaust path la for evacuating theprocessing space 1. In this embodiment, agas exhaust opening 6 a serving as the gas exhaust path la is formed below the substrate mounting table 3. - Specifically, in this embodiment, the gas exhaust path la is formed between inner peripheral portions (represented by
reference numerals quartz plate 6 and an outer peripheral portion (represented byreference numeral 3 b) of the substrate mounting table 3. Further, by forming thegas exhaust opening 6 a below the substrate mounting table 3, thegas exhaust opening 6 a can be shielded by the substrate mounting table 3. - By shielding the
gas exhaust opening 6 a by using the substrate mounting table 3, thebottom wall 2 b is prevented from being exposed directly to theprocessing space 1. Accordingly, thebottom wall 2 b can be surely shielded from theprocessing space 1 compared to a case in which thegas exhaust opening 6 a is provided at a position other than a position below the substrate mounting table 3. A plan view of thequartz plate 6 is illustrated inFIG. 6A . - As shown in
FIG. 6A , thequartz plate 6 has a circular shape and thegas exhaust opening 6 a is formed at a central portion of thequartz plate 6. In this embodiment, there is no opening other than thegas exhaust opening 6 a. Further, thequartz plate 6 has acutoff portion 6 b at a position corresponding to the loading/unloadingport 2 f in the same manner as thecylindrical portion 4 a. Theshutter 10 is arranged in thecutoff portion 6 b. A cross sectional view taken alongline 6B-6B ofFIG. 6A is illustrated inFIG. 6B . - As shown in
FIG. 6B , thequartz plate 6 includes ahorizontal portion 6 c extending horizontally and avertical portion 6 d extending vertically from the periphery of thegas exhaust opening 6 a to thegas exhaust room 7. Thehorizontal portion 6 c shields thebottom wall 2 b from theprocessing space 1. Thevertical portion 6 d shields a portion of thesidewall 2 a below the substrate mounting table 3 from theprocessing space 1. Further, thevertical portion 6 d extends to the inside of theopening 2 e of theprocessing container 2 as shown inFIG. 1B and shields an inner wall exposed in theopening 2 e from theprocessing space 1. Furthermore, thevertical portion 6 d is provided at the periphery of thegas exhaust opening 6 a to form a gas exhaust path from theprocessing space 1. - A
protrusion 6 e is formed on an upper surface of thehorizontal portion 6 c. Theprotrusion 6 e protrudes between the side surface of thecylindrical portion 4 a and the side surface of the substrate mounting table 3. The side surface of theprotrusion 6 e, particularly as shown inFIG. 5 , faces an area between thehorizontal portion 11 b of the first flowpath forming member 11 and thebottom surface 4 d of thecylindrical portion 4 a, i.e., a slit-shapedgap 4 e for introducing theprocessing gas 2 h into theprocessing space 1. - The
processing gas 2 h injected from thegap 4 e changes its flowing direction from the horizontal direction to the vertical direction toward an upper side of theprocessing space 1. Accordingly, theprocessing gas 2 h is injected to the upper side of theprocessing space 1 from an annular and slit-shapedgap 6 f formed between the side surface of thecylindrical portion 4 a and theprotrusion 6 e. In this embodiment, the slit-shapedgap 4 e for introducing theprocessing gas 2 h into theprocessing space 1 is arranged at a position lower than the substrate mounting table 3. In this configuration, it may be difficult to efficiently supply theprocessing gas 2 h to the target substrate W mounted on the substrate mounting table 3. - In the present embodiment, however, since the
protrusion 6 e is provided on the upper surface of thehorizontal portion 6 c of thequartz plate 6 and the processing gas inlet section for introducing the processing gas into theprocessing space 1 is configured to inject the processing gas from an outer periphery of the substrate mounting table 3 toward the upper side of theprocessing space 1, it is possible to efficiently supply theprocessing gas 2 h to the target substrate W mounted on the substrate mounting table 3. Further, a gas in theprocessing space 1 is exhausted from the outer periphery of the substrate mounting table 3 through an area below the substrate mounting table 3. - Further, particularly in this embodiment, a
quartz cover 12 made of high purity quartz is provided over an inner wall of thegas exhaust room 7 from theopening 2 e formed at thebottom wall 2 b, as shown inFIG. 1B . Thequartz cover 12 shields the inner wall of thegas exhaust room 7 from theprocessing space 1. - The inner wall of the
gas exhaust room 7 is not directly seen from theprocessing space 1. However, when lift pins for moving the target substrate W up and down are provided at the substrate mounting table 3, the inner wall of thegas exhaust room 7 may be directly seen from theprocessing space 1. Although not shown inFIGS. 1A to 6B , the lift pins are inserted into lift pin holes formed through the substrate mounting table 3. The inner wall of thegas exhaust room 7 may be seen from the processing space through the lift pin holes. In this case, it is preferable that thequartz cover 12 is provided over the inner wall of thegas exhaust room 7 from theopening 2 e formed at thebottom wall 2 b. - In this embodiment, the
microwave antenna 5 coupled to theceiling plate 4 is a planar antenna. The microwave radiated from the planar antenna is propagated to theprocessing space 1 via theceiling plate 4. A specific example of the planar antenna is a radial line slot antenna (RLSA) shown inFIG. 1B . -
FIG. 7 illustrates a specific example of the RLSA plasma processing apparatus in accordance with the embodiment of the present invention. InFIG. 7 , the same reference numerals are given to the same components as those inFIGS. 1A to 6B , and a description thereof is omitted. - As shown in
FIG. 7 , in this apparatus, astage cover 3 b made of, e.g., high purity quartz is provided on the substrate mounting table 3. Further, there are vertical movable lift pins 13, e.g., three lift pins 13 (only one is shown in the drawing). Lift pin holes 13 a are formed at the substrate mounting table 3 and thestage cover 3 b to pass the lift pins 13 therethrough. - Further, the
protrusion 6 e of thequartz plate 6 is provided to face thecylindrical portion 4 a and an upper end of theprotrusion 6 e is made rounded. By making the upper end of theprotrusion 6 e rounded, it is possible to efficiently guide the processing gas from the outer periphery of the substrate mounting table 3 toward the upper side of theprocessing space 1 above the target substrate W. - Further, a space is provided between the
protrusion 6 e and the periphery of thestage cover 3 b, the space serving as the gas exhaust path. The space extends obliquely from an area below thestage cover 3 b to an area below the substrate mounting table 3, and extends vertically downwardly from the area below the substrate mounting table 3. Furthermore, by making the upper end of theprotrusion 6 e rounded, it is possible to efficiently exhaust the processing gas from the outer periphery of the substrate mounting table 3 toward the area below the substrate mounting table 3. - In the apparatus shown in
FIG. 7 , flows (1) to (3) of introduction of the processing gas and flows (4) to (6) of exhaust of the processing gas are as follows. - (1) a downward flow between the side surface of the
cylindrical portion 4 a and the second flowpath forming member 2 i (first flow path) - (2) a horizontal flow between the bottom surface of the
cylindrical portion 4 a and thehorizontal portion 11 b of the first flow path forming member 11 (second flow path) - (3) an upward flow between the side surface of the
protrusion 6 e and the side surface of thecylindrical portion 4 a (third flow path) - (4) a downward flow between the side surface of the
protrusion 6 e and the periphery of thestage cover 3 b (first exhaust path) - (5) a downward oblique flow between the
quartz plate 6 and the lower sides of thestage cover 3 b and the substrate mounting table 3 (second exhaust path) - (6) a downward flow along the
vertical portion 6 d of thequartz plate 6 below the substrate mounting table 3 (third exhaust path) - A process for forming a silicon oxide film was conducted as a test example by using the apparatus shown in
FIG. 7 . More specifically, an Ar/O2 plasma oxidation process using oxygen as a processing gas and argon as a dilution gas was conducted and thicknesses (expressed in angstrom (Å)) of the silicon oxide films were measured for various parameter sets of oxygen concentration (O2 concentration) and pressure. The oxidation process was conducted under the following conditions: -
- a process time: 360 seconds
- a temperature of the substrate mounting table 3: 400□
- a flow rate: 500 to 1000 sccm (e.g., 1000 sccm, 500 sccm at O2 concentration of 100%)
- a power density: 0.41 to 4.19 W/cm2 (e.g., 2.85 W/cm2)
- a microwave power: 500 to 5000 W
- The results of the test example are shown in
FIG. 8A . Further, as a comparative example,FIG. 8B illustrates the results of a process for forming a silicon oxide film by using a conventional apparatus in which thecylindrical portion 4 a is not provided. The test content and the process conditions are the same as those of the above-mentioned test example. InFIGS. 8A and 8B , blanks represent cases in which evaluation was impossible due to an unstable plasma. -
FIG. 9 illustrates the results of comparison between the results ofFIG. 8A and the results ofFIG. 8B , i.e., values obtained by an equation: (the film thickness of the test example/the film thickness of the comparative example)×100(%). - As shown in
FIG. 9 , it was found from the results of comparison that the oxidation rate of the test example is lower than that of the comparative example at a low pressure (e.g., 0.05 Torr) and a low oxygen concentration (e.g., less than 25%), whereas the oxidation rate of the test example is higher than that of the comparative example at an oxygen concentration of 50% or more, regardless of the pressure. - Further, it can be seen that the oxidation rate of the test example is higher than that of the comparative example at a pressure of 0.5 Torr or more, regardless of the oxygen concentration.
- As described above, with the plasma processing apparatus in accordance with the embodiment of the present invention, it is possible to achieve not only an effect of prevention of metal contamination, but also an advantage of a high oxidation rate, particularly, at a high oxygen concentration and a high pressure.
- Especially, as shown in
FIG. 8A , the thicknesses of the silicon oxide films formed at a pressure of 5 Torr and an oxygen concentration of 100% and at a pressure of 9 Torr and oxygen concentrations of 75% and 100% all exceed 50 angstrom (5 nm), which means that the oxidation rate is increased by 56% to 144% compared to the comparative example. Particularly, when the pressure is 9 Torr and the oxygen concentration is 100%, the silicon oxide film is formed to have a thickness of 94.166 angstrom (about 9.4 nm), which exhibits a maximum oxidation rate. A high oxidation rate at a high pressure, particularly, a high oxidation rate twice or more that of the comparative example at a pressure of 9 Torr, contributes to improvement in the processing rate, which is advantageous in a semiconductor process in the future. - Further, as shown in
FIG. 9 , a 25% increase in the oxidation rate under the high oxygen concentration and the high pressure, which is an optimal condition for the process, is obtained at a pressure of 5 Torr or more and an oxygen concentration of 75% or more and at a pressure of 9 Torr or more and an oxygen concentration of 50% or more, as shown inFIG. 9 . -
FIG. 10 is a graph showing the results ofFIG. 9 . - As shown in
FIG. 10 , the oxidation rate is improved compared to the comparative example at a pressure of 0.5 Torr or more regardless of the oxygen concentration (02 concentration). - Further, it was found that the oxidation rate increases as the oxygen concentration increases at a pressure of 0.5 Torr or more, particularly, 1 Torr or more, and an oxygen concentration of 25% or more.
- In
FIG. 10 , curves I and II represent cases of oxygen concentrations of 25% and 50%, respectively, and curves III and IV represent cases of oxygen concentrations of 75% and 100%, respectively. As represented by curves I to IV, the oxidation rate increases as the oxygen concentration increases at a pressure of 0.5 Torr or more, particularly, 1 Torr or more, and an oxygen concentration of 25% or more. - From the results of
FIG. 10 , it is concluded that a plasma processing method capable of forming oxide at a high rate is obtained by setting a pressure of 0.5 Torr or more and an oxygen concentration of 25% or more while forming a silicon oxide film. - It is thought that this conclusion is caused by a difference in a diffusion path of the processing gas in which the processing gas is introduced from a vicinity of the outer periphery of the substrate, and a difference in a shape of the
processing space 1 in which metal members in the processing container is prevented from being exposed to the processing space. -
FIG. 11A is a cross sectional view schematically showing the apparatus in accordance with the embodiment of the present invention.FIG. 11B is a cross sectional view schematically showing the apparatus of the comparative example. - The apparatuses shown in
FIGS. 11A and 11B have the following differences. That is, the apparatus in accordance with the embodiment of the present invention has thecylindrical portion 4 a and the apparatus of the comparative example does not have thecylindrical portion 4 a. In the apparatus of the embodiment of the present invention, asupply place 50 of the processing gas is arranged laterally below the target substrate W and, accordingly, a conductance of the gas exhaust path is reduced. In contrast, thesupply place 50 of the processing gas is arranged above the target substrate W in the apparatus of the comparative example. - Meanwhile, a
gas exhaust place 51 is arranged below the target substrate W in both the apparatuses. However, an exhaust flow is formed above the outer periphery of the target substrate W in the configuration of the comparative example in which a baffle plate is provided at the outer periphery of the mounting table. In the apparatus of the embodiment of the present invention, by contrast, a gas exhaust path is formed between thequartz plate 6 and the area below the mounting table. - Accordingly, a distance from the
supply place 50 to theexhaust place 51 of the processing gas is small in the apparatus of the embodiment of the present invention, whereas the distance from thesupply place 50 to the exhaust place 51 (i.e., from the upper side of theprocessing space 1 to the lower side of the processing space 1) is large in the comparative example. Furthermore, in the embodiment of the present invention, theexhaust place 51 of the processing gas is arranged at a position higher than the position of thesupply place 50 of the processing gas. - The following conjecture can be made from above-described differences.
- In the embodiment of the present invention, both the
supply place 50 and theexhaust place 51 of the processing gas are arranged on the lateral and lower sides of theprocessing space 1. Further, the position of theexhaust place 51 is higher than the position of thesupply place 50. Besides, thesupply place 50 and theexhaust place 51 adjoin each other with theprotrusion 6 e of thequartz plate 6 between them. Accordingly, the distance from thesupply place 50 to theexhaust place 51 is small, so that the processing gas supplied to theprocessing space 1 can be exhausted immediately and only a minimum amount of processing gas required for a plasma process such as an oxidation process can be diffused into theprocessing space 1. - Moreover, since the
supply place 50 and theexhaust place 51 adjoin each other with theprotrusion 6 e between them, the processing gas supplied from thesupply place 50 passes through the area above theexhaust place 51 before it reaches the area above the target substrate W. Accordingly, the supplied processing gas is partially exhausted before it reaches the area above the target substrate W. Thus, only a minimum amount of the processing gas necessary for the plasma process is diffused to the area above the target substrate W and a gas unnecessary for the plasma process is exhausted. - Generally, 10% or less of the processing gas supplied to the
processing space 1 is actually used in the plasma process. 90% or more of the processing gas is unnecessary and the unnecessary gas may hinder a plasma process such as an oxidation process. However, in this embodiment, since the unnecessary gas is hardly diffused to the area above the target substrate W, a processing rate such as an oxidation rate does not decrease even under a high pressure. Far from decreasing, as shown inFIGS. 9 and 10 , the processing rate (oxidation rate) was mostly improved. - By comparison, in the comparative example, the
supply place 50 of the processing gas is arranged at the upper side of theprocessing space 1 and theexhaust place 51 of the processing gas is arranged at the lower side of theprocessing space 1. Accordingly, the distance from thesupply place 50 to theexhaust place 51 is large and most of the supplied processing gas is diffused into theprocessing space 1. In the comparative example, the processing gas supplied to theprocessing space 1 passes through the area above or around the target substrate W. Accordingly, a gas unnecessary for a plasma process tends to be diffused to the area above or around the target substrate W. Particularly, under a high pressure, an amount of unnecessary gas becomes larger, thereby hindering oxidation. - Further, in the embodiment of the present invention, the
cylindrical portion 4 a made of quartz, i.e., a dielectric, is extended to the lateral side of the target substrate W. Accordingly, the entire target substrate W (the area above and around the target substrate W) is enclosed by the dielectric in theprocessing space 1. The microwave passes through the dielectric. - As described above, the side surface and the upper surface of the target substrate W are enclosed by the dielectric allowing the microwave to pass therethrough. By supplying the microwave through the dielectric and supplying the processing gas from a lower lateral side of the target substrate W (the substrate mounting table 3), a microwave plasma can be generated in the closest position to the target substrate W. Since the concentration of the processing gas is high above the upper surface of the target substrate W and the microwave plasma is generated in the closest position to the target substrate W, efficiency of the oxidation process can be improved.
- By comparison, in the comparative example, only the
ceiling plate 4 is a dielectric and the processing gas is supplied from the upper side of the processing gas. Accordingly, a microwave plasma is easily generated at the upper side of theprocessing space 1, that is, at a place close to theceiling plate 4. Thus, in the comparative example, the plasma tends to be generated at a place separated from the target substrate W compared to the embodiment of the present invention, thereby reducing efficiency of the oxidation process. - From the above facts, it is conjectured that the plasma processing apparatus in accordance with the embodiment of the present invention generally has a high processing rate such as an oxidation rate, particularly, in a plasma process under high oxygen concentration and high pressure compared with the apparatus without the
cylindrical portion 4 a. - As described above, in the plasma processing apparatus in accordance with the embodiment of the present invention, the inner wall of the
processing container 2 is covered with quartz not to be exposed to theprocessing space 1, thereby achieving a high processing rate. - Further, by covering the inner wall of the
processing container 2 with quartz not to be exposed to theprocessing space 1, it is possible to reduce contamination caused by metal scattered from the inner wall of theprocessing container 2. - Therefore, in the plasma processing apparatus in accordance with the embodiment of the present invention, it is possible to precisely form a high quality film with a high processing rate.
- While the invention has been shown and described with respect to the embodiments, various changes and modification may be made without being limited thereto. Further, the embodiment of the present invention is not limited to the above-described embodiments.
- For example, although the oxidation process was described as the plasma process in the above embodiments, the apparatus in accordance with the embodiment of the present invention may be also applied to, e.g., a nitriding process, an oxidizing-nitriding process or a film forming process without being limited to the oxidation process.
- Further, although the RLSA was described as the microwave antenna, a microwave antenna other than the RLSA may be used.
- Further, the present invention may be applied to other plasma processing apparatuses such as a parallel plate type plasma processing apparatus, a surface wave plasma processing apparatus, a magnetron plasma processing apparatus and an inductively coupled plasma processing apparatus.
Claims (19)
1. A plasma processing apparatus comprising:
a metallic processing container forming a processing space in which a plasma process is performed;
a substrate mounting table provided in the processing space to mount a target substrate thereon;
a quartz member which shields a sidewall of the metallic processing container from the processing space and whose lower end extends to a position lower than a substrate mounting surface of the substrate mounting table;
an annular member which is made of quartz and is provided between a bottom surface of the quartz member and a bottom wall of the metallic processing container to shield the bottom wall of the metallic processing container from the processing space; and
a processing gas inlet section for introducing a processing gas into the processing space from a vicinity of an outer periphery of the substrate mounting table.
2. A plasma processing apparatus comprising:
a metallic processing container forming a processing space in which a plasma process is performed;
a substrate mounting table provided in the processing space to mount a target substrate thereon;
a quartz ceiling plate provided at an upper portion of the processing container to face a substrate mounting surface of the substrate mounting table and having a cylindrical portion which shields a sidewall of the metallic processing container from the processing space;
a microwave antenna coupled to the quartz ceiling plate;
a quartz plate which is provided between a bottom surface of the cylindrical portion and a bottom wall of the metallic processing container to shield the bottom wall of the metallic processing container from the processing space; and
a processing gas inlet section for introducing a processing gas into the processing space from a vicinity of an outer periphery of the substrate mounting table.
3. The plasma processing apparatus of claim 2 , wherein the quartz plate has a gas exhaust opening formed below the substrate mounting table to exhaust a gas in the processing space from below the substrate mounting table.
4. The plasma processing apparatus of claim 2 , wherein the quartz plate has a protrusion provided between a side surface of the cylindrical portion and a side surface of the substrate mounting table.
5. The plasma processing apparatus of claim 4 , wherein the cylindrical portion has a portion facing the protrusion.
6. The plasma processing apparatus of claim 2 , further comprising:
a gas inlet opening formed at the sidewall of the metallic processing container to introduce the processing gas into the processing space; and
a gas flow path forming member which is provided between the cylindrical portion and the sidewall of the metallic processing container, guides the processing gas toward a bottom surface of the cylindrical portion along the cylindrical portion, and introduces the processing gas into the processing space through an area below the bottom surface of the cylindrical portion.
7. The plasma processing apparatus of claim 2 , further comprising:
an opening formed at the bottom wall of the metallic processing container;
a metallic exhaust room connected to the opening and a gas exhaust unit; and
a quartz cover which is provided over an inner wall of the metallic exhaust room from the opening formed at the bottom wall to shield the inner wall of the metallic exhaust room from the processing space.
8. The plasma processing apparatus of claim 2 , further comprising:
a loading/unloading port which is formed at the sidewall of the metallic processing container and through which the target substrate is loaded into/unloaded from the processing space;
a cutoff portion formed at a portion of the cylindrical portion corresponding to the loading/unloading port; and
a shutter made of quartz and provided between the cutoff portion and the loading/unloading port.
9. The plasma processing apparatus of claim 2 , wherein the microwave antenna is a planar antenna.
10. The plasma processing apparatus of claim 9 , wherein the planar antenna is a radial line slot antenna (RLSA).
11. The plasma processing apparatus of claim 2 , wherein the plasma processing apparatus is an apparatus for forming a silicon oxide film.
12. A plasma processing method for forming a film by using a microwave plasma, comprising:
supplying a microwave to a dielectric enclosing an outer periphery or an upper surface of a target substrate and allowing a microwave to pass therethrough; and
supplying a processing gas from the outer periphery of or below the target substrate while the microwave is supplied to the dielectric.
13. The plasma processing method of claim 12 , wherein the processing gas is supplied to an area above the target substrate after passing through an area above a gas exhaust port through which the processing gas is exhausted.
14. The plasma processing method of claim 12 , wherein the film to be formed is a silicon oxide film.
15. The plasma processing method of claim 14 , wherein the processing gas for forming the silicon oxide film has an oxygen concentration of 50% or more.
16. The plasma processing method of claim 14 , wherein the silicon oxide film is formed at a pressure of 0.5 Torr or more.
17. The plasma processing method of claim 16 , wherein the processing gas for forming the silicon oxide film has an oxygen concentration of 25% or more.
18. The plasma processing method of claim 12 , wherein the processing gas is exhausted from the outer periphery of and below the target substrate.
19. The plasma processing method of claim 18 , wherein a position of an exhaust place of the processing gas is higher than a position of a supply place of the processing gas.
Applications Claiming Priority (3)
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JP2007256964A JP2009088298A (en) | 2007-09-29 | 2007-09-29 | Plasma treatment apparatus and plasma treatment method |
JP2007-256964 | 2007-09-29 | ||
PCT/JP2008/067611 WO2009044693A1 (en) | 2007-09-29 | 2008-09-29 | Plasma processing apparatus and plasma processing method |
Publications (1)
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US20100291319A1 true US20100291319A1 (en) | 2010-11-18 |
Family
ID=40526122
Family Applications (1)
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US12/680,645 Abandoned US20100291319A1 (en) | 2007-09-29 | 2008-09-29 | Plasma processing apparatus and plasma processing method |
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US (1) | US20100291319A1 (en) |
JP (1) | JP2009088298A (en) |
KR (1) | KR20100061702A (en) |
CN (1) | CN101809724B (en) |
WO (1) | WO2009044693A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN101809724A (en) | 2010-08-18 |
JP2009088298A (en) | 2009-04-23 |
KR20100061702A (en) | 2010-06-08 |
CN101809724B (en) | 2012-09-05 |
WO2009044693A1 (en) | 2009-04-09 |
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